9-1
Chapter 9. MAINTENANCE AND
TROUBLESHOOTING
Maintenance
z
Cleaning
When removing the dirt from the measuring instrument, wipe it off with a soft cloth
rag. At this time, do not use any organic solvent, such as paint thinner or benzene.
z
Part replacement
Do not replace any parts of this unit.
z
Fuse replacement
When replacing the fuse connected to the electric wiring, always use the specified
standard fuse.
Standard IEC127
Shut-down speed Slow-action type (T)
Rated voltage 250 V AC
Rated current 0.2 A
Alarm display and corrective action
The following table shows the alarm displays and corrective actions if any failure
occurs in this unit:
Alarm code Failure name Cause Corrective action
AL0
1
PV input failure
(Over-range)
Sensor burnout, incorrect wiring,
incorrect PV input type setting
Check the wiring.
Set the PV input type again.
AL02
PV input failure
(Under-range)
Sensor burnout, incorrect wiring,
incorrect PV input type setting
AL03
CJ failure Terminal temperature is faulty
(thermocouple).
Use the unit at an ambient temperature
meeting the operating conditions stated
in the specification.
PV input failure Sensor burnout, incorrect wiring (RTD) Check the wiring.
AL
1
1
CT input failure
(over-range)
(CT input 1 or 2,
or both)
A current exceeding the upper limit of
the display range was measured.
The number of CT turns or the
number of CT power wire loops is
incorrectly set, or wiring is incorrect.
• Use a CT with the correct number of
turns for the display range.
• Reset the number of CT turns.
• Reset the number of CT power wire
loops.
• Check the wiring.
AL70
A/D conversion
failure
A/D converter is faulty. It is thought that the main unit needs
to be replaced.
Contact the azbil Group or its dealer.
AL95
Set data failure Data is corrupted by noise.
Power is shut-down while the data is
being set.
Turn ON the power again.
If the same alarm occurs after that,
set the data (set data for AL95/97 and
adjustment data for AL96/98) and turn
ON the power again.
If the same alarm occurs again even
after the above steps have been taken,
the main body needs to be replaced.
Contact the azbil Group or its dealer.
AL96
Adjustment data
failure
Power is shut-down while the data is
being set.
Data is corrupted by noise.
AL97
Set data failure
(RAM area)
Data is corrupted by noise.
AL98
Adjustment data
failure (RAM area)
Data is corrupted by noise.
AL99
ROM failure ROM (memory) is faulty. Turn ON the power again. If the same
alarm occurs again, the main unit needs
to be replaced.
Contact the azbil Group or its dealer.
Handling Precautions
• If ROM version 1 of the instrument information bank (
I
d02
) is prior to
2.04, CT input failure (
AL
1
1
) is not displayed.
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